As hard as it is, please try not to panic. All children are different and develop at different paces.
You may do the following already so apologies if it sounds patronising.
Do you read to her? Make sure you read lots of books to her. My son is 7 and we are reading the faraway tree books at the moment - mainly me reading. Apparently, when I was a tiny baby, my Dad used to read his Wilbur Smith books aloud to me😂 obviously, I couldn't understand the stories but I do believe it helped me as despite being dyslexic, my reading is good and I read for pleasure a lot.
Agree with PP about getting books she is interested in. When my son was learning, those bloody biff and chip books were mind numbing!
With maths, things like baking, simple adding up in the supermarket, 'can you get 6 apples and 4 bananas for me?' How many items is that? It all helps.
My son's handwriting was poor in Y1. Content was fine but his actual writing was shocking and I was convinced he would never be able to join up so it was legible. However, although it took time,he is now in Y3 and his writing is so much better. Neat, joined and readable.